Ephemeral Cluster

This repository contains configuration files and related scripts to starting Celestia and/or Ethermint clusters using docker compose

NOTE: Previous iterations of this repo supported a lot more configs, they were infrequently to never used and unmaintained. Repo has been cleaned up to minimally useful functionality.

Dependencies

You must have both Docker and Docker Compose v2 installed

Install Docker: (https://docs.docker.com/engine/install/)
Install Docker Compose: (https://docs.docker.com/compose/install/)

Setup

Minimal Celestia Cluster

Not currently functional Minimal Celestia Cluster

scripts/minimal-celestia.sh

This is the most minimal cluster possible.

Minimal Ethermint Cluster

Minimal Ethermint Cluster

To setup the docker compose cluster run

scripts/minimal-ethermint.sh

Cluster(s) Information

Each container in the cluster has its own static IP Address. Clusters with only a single instance of a given type use the lowest number in the range.

Component	IP Address
Core Node	192.167.10.0
Bridge Nodes	192.167.1.0
Light Nodes	192.167.2.0
DALC	192.167.3.0
Ethermint	192.167.4.0

Interacting with the cluster

All containers run on the same docker compose network docker_localnet. The easiest way to reach a container is to run curl from a docker container within the network.

A single call to core0 retrieving the first block:

docker run --network docker_localnet --rm curlimages/curl:7.80.0 -s "192.167.10.0:26657/block?height=1"

Docker compose also sets up DNS within the network so you can reference a given container by its name

docker run --network docker_localnet --rm curlimages/curl:7.80.0 -s "core0:26657/block?height=1"

To start an interactive session on a curl container

docker run -it --network docker_localnet curlimages/curl:7.80.0 bash

Deploying a Smart Contract

This assumes you're using one of the Ethermint clusters

You can follow the logs for the ethermint container with

docker logs ethermint0 -f

We'll use https://github.com/gakonst/foundry for this

curl -L https://foundry.paradigm.xyz | bash
# Reload your path or do this in a new terminal
foundryup

Set your environment variables

export ETH_RPC_URL=http://127.0.0.1:8545
export PRIV_KEY=$(docker exec ethermint0 bash -c 'ethermintd keys unsafe-export-eth-key mykey --keyring-backend test')
# And the PRIV_KEY from above

Create an example smart contract, I’ve been using the simple storage one

pragma solidity >=0.7.0 <0.9.0;

/**
 * @title Storage
 * @dev Store & retrieve value in a variable
 */
contract Storage {

    uint256 number;

    /**
     * @dev Store value in variable
     * @param num value to store
     */
    function store(uint256 num) public {
        number = num;
    }

    /**
     * @dev Return value
     * @return value of 'number'
     */
    function retrieve() public view returns (uint256){
        return number;
    }
}

Set up a directory using forge in a new terminal

forge init hello_foundry
cd hello_foundry/src
ls .

There should be two files

Contract.sol  test

Replace Contract.sol with the above storage contract

forge build --force
forge create Storage --private-key=$PRIV_KEY

You should get something like

compiling...
no files changed, compilation skipped.
Deployer: 0xa2e2a047c2af7589294626c3d8220f56d49f01c4
Deployed to: 0xdcebe71fb4bad3f1d15451589700d08ce930b054
Transaction hash: 0x8bdeb6a753bff968a295638520c2d8dd2c1813adc8a93b722a13e91d1365197c

Grab the “Deployed to” address and save it to an env var

export CON_ADDR=0xdcebe71fb4bad3f1d15451589700d08ce930b054

Interacting with the contract using cast

Get the initial storage value

cast call $CON_ADDR "retrieve()"

Returns

0x0000000000000000000000000000000000000000000000000000000000000000

Update the storage value to 1

cast send $CON_ADDR "store(uint256)" 1 --private-key=$PRIV_KEY

Returns

blockHash            "0x33efb5b3baad6aa911aa8f89c5e82a799357d12665f619dec2560d66bd8f35dc"
blockNumber          "0x7"
contractAddress      null
cumulativeGasUsed    "0xa9fc"
effectiveGasPrice    "0xca47ef05"
gasUsed              "0xa9fc"
logs                 []
logsBloom            "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
root                 null
status               "0x1"
transactionHash      "0x163366540f6ef1928f61054c8565482625fa6aaa61ecb8d5420b04751cb74e94"
transactionIndex     "0x0"
type                 "0x2"

Get the updated storage value

cast call $CON_ADDR "retrieve()"

Returns

0x0000000000000000000000000000000000000000000000000000000000000001

Teardown

To stop the cluster run

scripts/teardown-docker-cluster.sh